Comparing Ground Motion at the Current and Proposed Sites of the Metrology Laboratory

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2001

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Researchers at the Bureau of Economic Geology (Bureau) conducted a geophysical investigation for the Texas Department of Agriculture (TDA) to establish ambient vibration characteristics at the current Metrology Laboratory and at a proposed site near Giddings, Texas. We (1) constructed an accelerometer-based instrument capable of measuring low-acceleration (less than 0.001 g) ground motion in three orthogonal directions simultaneously, (2) measured ground motion at Giddings under various conditions, (3) measured low-level ground motion at the current laboratory, and (4) measured ground motion at a representative shallow-bedrock site at the J. J. Pickle Research Campus (PRC) at The University of Texas at Austin. We compared the results of ground-motion tests at the Giddings site (where bedrock depth is greater than 10 m) to those from PRC to investigate the likely influence of bedrock depth on the suitability of the site for laboratory operation.

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